olondono.blogspot.com/2008/02/sending-mail-using-smtpclient.html

// Mail message construction

MailMessage mm = new MailMessage("youraccount@gmail.com", "destination@mail.com");



// content

mm.Subject = "testing message";

mm.Body = "hello... from .net c# mailmessage";

mm.CC.Add("copycc@mail.com");

mm.CC.Add("copycc2@mail.com");

mm.Bcc.Add("copybcc@mail.com");



// some attachments

mm.Attachments.Add(new Attachment("c:\\filename.txt"));



// Sending message

SmtpClient sc = new SmtpClient("smtp.gmail.com", 587);



// our account credentials

sc.Credentials = new NetworkCredential("youraccount@gmail.com", "yourpassword", "");

sc.EnableSsl = true;



// Catching result

try

{

    sc.Send(mm);

    MessageBox.Show("Message sent");

}

catch (Exception ex)

{

    MessageBox.Show("Error: " + ex.Message);

}